(j3.2006) ASSOCIATE and DO CONCURRENT LOCAL

[Robert Corbett]

On 05/26/16 12:32, Bill Long wrote:
> A question came up about ASSOCIATE interacting with OpenMP, but the same concept applies to the new DO CONCURRENT enhancements.   Suppose you have
>
> A = 1
> ASSOCIATE ( B =>  A )
>
>     DO CONCURRENT (i=1:1)  LOCAL (B)
>
>          X = A   ! B is undefined - does that cause A to be undefined as well?
>          B = 2   ! Does this cause A to change value?
>
>     END DO
>
> END ASSOCIATE
>
> print *, A, X
> end
>
> Are there words in the standard to cover this interaction?

Yes.

The first occurrence of B is a construct entity of the ASSOCIATE
construct (paragraph 1 of Subclause 16.4 of 16-007).  The second
occurrence of B is a construct entity of the DO construct
(paragraph 2 of Subclause 8.1.6.5).  They are different entities.
The B that is the associate name is associated with the variable
identified by A.  The B that is a construct entity of the DO
construct is not associated with the variable identified by A.

Robert Corbett